assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:3617  rdfs:subClassOf  DOID:3616  _IRI        
1          0           graph  DOID:3616  oio:id           DOID:3616  xsd:string  
1          0           graph  DOID:3615  rdfs:subClassOf  DOID:3616  _IRI